I'm getting the same error as you on all goatchat servers using kiwi.
Edit: Freenode works fine, looks like its just goatchat that is fucked on kiwi.
It is Kiwi, not goatchat. Unless you can figure out the dreaded password boxes, you'll have to wait until Kiwi fixes itself.
Or you could try connecting with another server.
@Jambo try the links provided by PMYA in the thread.